Security Deposit Calculator Formula

Understand the math behind the security deposit calculator. Each variable explained with a worked example.

Use the Security Deposit Calculator

Formulas Used

Security Deposit

security_deposit = monthly_rent * deposit_multiplier

Total Upfront (Deposit + Pet + First Month)

total_upfront = monthly_rent * deposit_multiplier + pet_deposit + monthly_rent

Total Deposits Only

total_deposits = monthly_rent * deposit_multiplier + pet_deposit

Variables

VariableDescriptionDefault
monthly_rentMonthly Rent(USD)2000
deposit_multiplierDeposit Multiplier1
pet_depositPet Deposit(USD)0

How It Works

Security Deposit Calculation

Security deposits protect landlords against property damage and unpaid rent.

Formula

Security Deposit = Monthly Rent x Multiplier

Total Upfront = Security Deposit + Pet Deposit + First Month Rent

Legal Limits

  • Many states cap security deposits at 1-2 months rent
  • Some jurisdictions require deposits be held in interest-bearing accounts
  • Returns must be made within a set period after moveout (typically 14-30 days)

    • Worked Example

    $2,000/month rent with a deposit of 1x monthly rent and no pet deposit.

    monthly_rent = 2000deposit_multiplier = 1pet_deposit = 0
    1. 01Security deposit: $2,000 x 1 = $2,000
    2. 02Total deposits: $2,000 + $0 = $2,000
    3. 03Total upfront with first month: $2,000 + $0 + $2,000 = $4,000

    Ready to run the numbers?

    Open Security Deposit Calculator